--- title: "Fish Emulsion Fertiliser: Ocean Nutrients for Your Garden" description: Use fish emulsion (5-1-1) for the cheapest organic liquid fertilizer. Dilution rates, application timing, brand comparison, DIY recipe, and smell management. image: https://growperma.com/hubfs/blog/images/gp-0149-fish-emulsion-hero.webp --- [Skip to content](https://growperma.com/blog/fish-emulsion-fertiliser-ocean-nutrients-for-your-garden#main-content) [![GrowPerma Logo](https://growperma.com/hs-fs/hubfs/icon-512.png?width=40&height=40&name=icon-512.png)](https://growperma.com/) - [Blog](https://growperma.com/blog) - [About](https://growperma.com/about) [Join the Weekly Dig](https://growperma.com/newsletter) - [Blog](https://growperma.com/blog) - [About](https://growperma.com/about) [Join the Weekly Dig](https://growperma.com/newsletter) ![Gardener pouring liquid fish emulsion fertilizer from a brown bottle into a green watering can in a sunny vegetable garden](https://growperma.com/hs-fs/hubfs/blog/images/gp-0149-fish-emulsion-hero.webp?width=1200&height=520&name=gp-0149-fish-emulsion-hero.webp) In This Article Table of Contents ![Peter Vogel](https://growperma.com/hubfs/Peter%20Vogel%20Portait.png) Peter Vogel Peter Vogel is the founder of GrowPerma, bringing together evidence-based gardening advice with permaculture principles. When he's not writing about companion ... [Soil & Composting](https://growperma.com/blog/tag/soil-composting) May 21, 2026 # Fish Emulsion Fertiliser: Ocean Nutrients for Your Garden Your tomato seedlings just transplanted and look stressed. Your lettuce is pale yellow-green instead of deep emerald. Your container basil has stalled. Every one of these is a nitrogen problem, and the cheapest, fastest, organic-certified solution sitting on the shelf at any garden center is fish emulsion. A $15 quart bottle treats 2,500 sq ft of garden for the entire season at the recommended dilution. It feeds your plants and the soil microbes that feed your plants. It is OMRI-listed for certified-organic growing. It also smells, which is the one downside everyone warns you about and which you will get used to in under a week. This guide covers the NPK math, dilution rates, what crops respond best, the DIY recipe, brand comparisons, and the smell-management tricks that actually work. 5-1-1 Standard NPK ratio Alaska Fish Fertilizer label 1-2 tbsp Per gallon water for soil drench Manufacturer label rate Every 2-3 wks Application frequency OSU Extension ~$0.05 Per gallon of diluted feed Per-application cost ## What fish emulsion actually is Fish emulsion is the liquid byproduct of processing fish for human consumption (or in some cases waste fish from commercial fishing). The raw material is cooked, pressed, and partially fermented. The result is a brown amber liquid containing 4 to 5 percent nitrogen, 1 to 4 percent phosphorus, and 1 percent potassium, depending on the source and processing. The [USDA Agricultural Marketing Service liquid fish products page](https://www.ams.usda.gov/rules-regulations/organic/petitioned-substances/liquid-fish-products) classifies it as an allowed substance under USDA Organic regulations, making it the workhorse liquid fertilizer in certified-organic vegetable production. There are two technical variants you will see on labels: | Type | Process | Typical NPK | Smell | | --- | --- | --- | --- | | Fish emulsion | Heat-processed, partially deodorized | 5-1-1 | Strong fishy | | Fish hydrolysate | Cold-enzyme digestion, retains amino acids | 2-4-1 | Milder, earthier | Sources:. For most home gardens the distinction does not matter. Both feed plants the same way. Hydrolysate has more amino acids and trace nutrients for soil microbes, and it smells less, so it costs more. If you grow on a balcony or you cannot stand the smell, pay the premium for hydrolysate. ![Close-up of healthy lush dark-green lettuce, kale, and Swiss chard plants in a vegetable bed being watered with a fine-spray watering can](https://growperma.com/hubfs/blog/images/gp-0149-leafy-greens-body1.webp) ## How to mix and apply it Manufacturer label rates from [Alaska Fish Fertilizer 5-1-1 label (PDF)](https://www.domyown.com/msds/Pennington_Alaska_Fish_Emulsion_Fertilizer_Concentrate_5-1-1_Label_2020.pdf) and [University of Illinois Extension guidance](https://extension.illinois.edu/news-releases/scale-your-gardens-health-fish-emulsion-fertilizer) converge on these dilution rates: | Application | Dilution | Frequency | | --- | --- | --- | | Soil drench, established vegetables | 1 tbsp per 1 gallon water | Every 2 to 3 weeks | | Soil drench, heavy feeders (tomato, corn, brassicas at peak) | 2 tbsp per 1 gallon water | Every 2 weeks | | Foliar spray | 1 tbsp per 1 gallon water | Every 2 weeks | | Transplant starter | 1 tbsp per 1 gallon water | At transplant + 7 days later | | Seedlings / indoor seed starts | 1 tsp per 1 gallon water | Weekly | Sources:. ![Two glass mason jars labeled Foliar Spray and Soil Drench with different amber dilutions on a wooden potting bench](https://growperma.com/hubfs/blog/images/gp-0149-dilution-body2.webp) Two timing rules from [NC State Extension's Fertilizer From the Sea guide](https://newcropsorganics.ces.ncsu.edu/organics/fertilizer-from-the-sea/): apply in early morning or evening (never in midday heat or sun, the foliar version will scorch leaves), and water the soil first if applying as a drench (dry roots take up too much too fast). Both rules apply to every liquid organic fertilizer, not just fish emulsion. Why this works (the "feed the soil, not the plant" principle) Synthetic fertilizers feed the plant directly. Fish emulsion feeds the plant AND the soil microbes that surround the roots. The peptides and amino acids in hydrolyzed fish protein, documented in a [2020 PMC review of fish byproduct biostimulants](https://pmc.ncbi.nlm.nih.gov/articles/PMC7179184/), stimulate bacterial and fungal growth in the rhizosphere. Those microbes then unlock nutrients already in your soil that synthetic fertilizers cannot access. Over 2 to 3 seasons of regular fish emulsion use, you build a living soil that needs progressively less external input. That is the permaculture endgame: a soil so alive it largely feeds itself. ## Which crops respond best ![Tomato seedling being transplanted into a garden bed with a bottle of fish emulsion fertilizer nearby](https://growperma.com/hubfs/blog/images/gp-0149-transplant-floatleft.webp) Fish emulsion shines on plants that need a sustained nitrogen push during active growth. The crops with the biggest measurable response in extension trials and farm reports: - **Leafy greens** (lettuce, spinach, kale, chard, Asian greens). The deepest green color you can grow comes from fish emulsion at 1 tbsp per gallon every 2 weeks. - **Brassicas** (broccoli, cabbage, cauliflower, Brussels sprouts). Heavy nitrogen feeders that respond strongly to fish emulsion during head development. - **Tomatoes and peppers during vegetative growth**. Switch to a higher-phosphorus feed (like the 2-4-1 hydrolysate or kelp) once flowering begins, otherwise too much nitrogen produces lush leaves and few fruits. - **Seedlings and transplants**. A 1 tsp per gallon starter solution at transplant time reduces shock and gets roots moving fast. - **Container plants**. Pot soil leaches nutrients fast; fish emulsion at 1 tbsp per gallon every 2 weeks keeps containers productive. - **Corn** at the 8-leaf stage and again at silking. Sweet corn is a brutal nitrogen feeder. ## What NOT to use it on Skip fish emulsion on these Cacti and succulents (low-fertility natives, fish emulsion at vegetable-garden rates burns them; use at 1/4 strength or skip). Established native plant gardens (the natives evolved on low-N soils). Mature fruit trees in active fruit set (drives leaf growth at the expense of fruit). Anywhere your dog or cat will dig (the smell attracts them, see warning below). The cat-and-dog warning is the one most gardeners learn the hard way. Pets find the smell irresistible and will dig up freshly fertilized beds within 24 hours. [Elm Dirt's pet-safe fertilizer guide](https://www.elmdirt.com/blogs/news/pet-safe-fertilizers) recommends covering treated beds with a row cover or mulch for 24 to 48 hours after application. After that the surface smell dissipates and pets lose interest. ## Brand comparison: what to actually buy ![Infographic showing four liquid organic fertilizers with NPK numbers: fish emulsion, kelp tea, compost tea, worm casting tea](https://growperma.com/hubfs/blog/images/gp-0149-liquid-fertilizers-infographic.webp) | Brand | NPK | Price (per gallon) | OMRI-listed | Best for | | --- | --- | --- | --- | --- | | Alaska Fish Fertilizer 5-1-1 | 5-1-1 | ~$25 | Yes | Cheapest workhorse, strong smell | | Neptune's Harvest Hydrolyzed Fish | 2-4-1 | ~$45 | Yes | Higher P for flowering, milder smell | | Down To Earth Liquid Fish | 4-1-1 | ~$40 | Yes | Premium, consistent quality | | Bonide Fish Emulsion 2-4-0 | 2-4-0 | ~$25 | No | Affordable mid-range | Sources:. Prices retail US 2026. Practical advice for a typical home gardener: start with a quart of Alaska 5-1-1 (about $12 to $15). One quart is 64 tbsp, enough for 64 gallons of diluted feed. That covers a 500 sq ft vegetable garden for a full growing season with feedings every 2 weeks. If you hate the smell after the first application, switch to Neptune's Harvest hydrolysate the next time. ## DIY fish emulsion: cheap but commitment-heavy ![Large blue 5-gallon brewing bucket labeled DIY Fish Fertilizer with mason jar of molasses and stirring stick in a barn corner](https://growperma.com/hubfs/blog/images/gp-0149-diy-bucket-floatright.webp) If you process your own fish (recreational or commercial) and have an outdoor space the smell will not bother neighbors, you can ferment your own. The standard recipe from permaculture practitioners and [homestead fertilizer guides](https://thesurvivalgardener.com/how-to-make-homemade-fish-emulsion-fish-fertilizer-easy-way/): 1 Combine fish scraps + brown sugar/molasses + water In a 5-gallon (19 L) bucket: 2 parts fish scraps (heads, guts, frames), 1 part brown sugar or molasses, 3 parts water. Cover loosely with a cloth or lid with airholes. 2 Ferment 3 to 4 weeks Keep at 60 to 80°F (15 to 27°C). Stir every 2 to 3 days. The molasses feeds lactic-acid bacteria that out-compete the rot bacteria, keeping the smell merely awful rather than catastrophic. 3 Strain and dilute Strain through cheesecloth into a sealed jug. Dilute 1:10 to 1:20 with water for application. Store in a sealed jar in a cool dark place; lasts roughly 6 months. 4 Test NPK before bulk use Homemade batches vary widely (typically 2-1-1 to 4-2-1). A $20 home soil test kit will tell you whether your batch is balanced or nitrogen-heavy. Apply more cautiously than commercial products until you know. ## The smell, and how to manage it Yes, fish emulsion smells like fish. Strong fish. For about 24 hours after application, your garden smells like a wharf. The smell dissipates fast outdoors as soil microbes break down the organic matter. Three things that actually help: - Apply in the evening so overnight cool reduces volatilization and the smell is mostly gone by morning. - Water the bed lightly after the drench, working the fertilizer into the top inch (2.5 cm) of soil. - Switch to hydrolysate (2-4-1 type) which has roughly half the smell of emulsion. Worth the extra cost if your yard is small or your neighbors are close. Indoor and balcony gardeners should always use hydrolysate, not emulsion. The smell will not air out the same way it does in a backyard. ## Cost comparison vs other organic liquid fertilizers | Fertilizer | NPK | Cost per gallon diluted | Application frequency | | --- | --- | --- | --- | | Fish emulsion (Alaska 5-1-1) | 5-1-1 | ~$0.05 | Every 2-3 weeks | | Compost tea (homemade) | ~0.5-0.2-0.5 | ~$0.02 | Weekly | | Worm casting tea | ~0.5-0.5-0.5 | ~$0.05 | Weekly to biweekly | | Kelp meal tea | ~1-0-2 | ~$0.10 | Every 2 weeks | | Liquid blood meal (organic) | ~12-0-0 | ~$0.30 | Every 4 weeks | Estimates based on retail 2026 prices and label dilution rates from [U of I Extension fish emulsion guide](https://extension.illinois.edu/news-releases/scale-your-gardens-health-fish-emulsion-fertilizer) and [UMN Extension quick guide to fertilizing](https://extension.umn.edu/manage-soil-nutrients/quick-guide-fertilizing-plants). Fish emulsion is the most cost-effective organic liquid fertilizer per pound of nitrogen delivered. [Compost tea is cheaper](https://growperma.com/blog/compost-tea-how-to-brew-and-use-liquid-fertilizer) per gallon but delivers far less nitrogen per application. For nutrient density, fish emulsion wins. ## Permaculture context and history Squanto teaching the Pilgrims to plant a fish under each corn hill in 1621 is the most-cited example of pre-industrial fish fertilizer use in North America, though as [Lynn Ceci's Science article on fish fertilizer history](https://www.science.org/doi/10.1126/science.188.4183.26) documents, the practice may have actually been more European than native (the historical record is contested). What is clear is that fish-based fertilizer has been used along coastlines globally for centuries, and modern fish emulsion is the industrialized continuation of that tradition. The permaculture framing: you are converting a waste stream (fish processing byproduct) into soil fertility. [A 2021 PMC review on fish waste valorization](https://pmc.ncbi.nlm.nih.gov/articles/PMC7923225/) documents that 50 to 70 percent of fish processed for food becomes "waste" by weight, much of which is now recovered into fertilizer, pet food, and aquaculture feed. The bottom line Buy one quart of Alaska Fish Fertilizer 5-1-1 for $12 to $15. Mix 1 tablespoon per gallon of water. Apply to vegetables every 2 to 3 weeks during active growth. Apply in the evening to minimize smell and avoid leaf scorch. Skip on succulents, established natives, and fruit trees in fruit set. Use hydrolysate (2-4-1) on indoor plants or if you cannot tolerate the smell. Cover beds with row cover for 24 hours if you have curious pets. Your leafy greens will be the deepest green you have ever grown. ## FAQ ### How to make fish fertilizer at home? Combine 2 parts fish scraps, 1 part brown sugar or molasses, and 3 parts water in a 5-gallon bucket. Cover loosely and ferment for 3 to 4 weeks at 60 to 80°F, stirring every 2 to 3 days. Strain through cheesecloth. Dilute 1:10 to 1:20 with water for application. Expect a homemade NPK of 2-1-1 to 4-2-1, variable by fish source. ### Is fish emulsion good for all plants? Almost all vegetable garden crops respond well, especially leafy greens, brassicas, tomatoes during vegetative growth, corn, and container plants. Skip it on succulents, established native plantings, and fruit trees in active fruit set. Use at 1/4 strength on cacti if you use it at all. ### How much fish emulsion per gallon of water? 1 tablespoon per gallon for general soil drench on established vegetables. 2 tablespoons per gallon for heavy feeders at peak growth (tomatoes vegetative, brassicas heading, corn). 1 teaspoon per gallon for seedlings and indoor seed starts. Foliar spray rate is 1 tablespoon per gallon. ### How often to use fish fertilizer? Every 2 to 3 weeks during active growth (spring through summer). Stop fertilizing 4 to 6 weeks before expected harvest for fruiting crops to encourage the plant to put energy into ripening rather than new leaf growth. Container plants benefit from biweekly application throughout their growing season. ### Is fish emulsion organic? Most commercial fish emulsions are USDA Organic compliant and OMRI-listed (Alaska Fish Fertilizer 5-1-1, Neptune's Harvest, Down To Earth Liquid Fish). Always check the OMRI listing if you grow under a certified-organic plan. The USDA Agricultural Marketing Service liquid fish products page formally classifies it as allowed. ### How to make fish fertilizer not smell? Switch from emulsion (5-1-1) to hydrolysate (2-4-1) which retains amino acids and smells significantly milder. Apply in evening so cooler overnight temperatures reduce volatilization. Lightly water the bed after application to work the fertilizer into the top inch of soil. The smell mostly dissipates within 24 hours outdoors. ### Is fish emulsion the same as fish fertilizer? Fish fertilizer is the umbrella category. Fish emulsion is one type (heat-processed, 5-1-1, strong smell). Fish hydrolysate is the other major type (cold-enzyme processed, 2-4-1, milder smell, more amino acids). Both are organic liquid fertilizers from fish processing byproducts. ### Is fish fertilizer good for fruit trees? Yes during dormant winter and early spring before bloom, when you want to feed roots and stimulate spring leaf growth. Stop fish emulsion 4 to 6 weeks before bloom and switch to lower-nitrogen amendments. Continuing nitrogen during fruit set produces leafy growth at the expense of fruit set and ripening. Get the Weekly Dig One practical permaculture guide a week, written for gardeners who do this on weekends: building living soil without buying it in bags. Free, no spam, unsubscribe any time. [Join the Weekly Dig](https://growperma.com/newsletter) [Browse All Guides →](https://growperma.com/blog) ## Resources - [USDA Agricultural Marketing Service: Liquid Fish Products under Organic Rules](https://www.ams.usda.gov/rules-regulations/organic/petitioned-substances/liquid-fish-products) - [University of Illinois Extension: Scale Up Your Garden's Health with Fish Emulsion](https://extension.illinois.edu/news-releases/scale-your-gardens-health-fish-emulsion-fertilizer) - [NC State Extension: Fertilizer From the Sea](https://newcropsorganics.ces.ncsu.edu/organics/fertilizer-from-the-sea/) - [University of Minnesota Extension: Quick Guide to Fertilizing Plants](https://extension.umn.edu/manage-soil-nutrients/quick-guide-fertilizing-plants) - [PMC: Fish By-Product Use as Biostimulants Review (2020)](https://pmc.ncbi.nlm.nih.gov/articles/PMC7179184/) - [PMC: Fish Waste From Problem to Valuable Resource](https://pmc.ncbi.nlm.nih.gov/articles/PMC7923225/) - [Neptune's Harvest OMRI-Listed Products](https://www.neptunesharvest.com/omri-listed-products.html) - [Down to Earth OMRI-Listed Products](https://www.downtoearthdistributors.com/omri-listed-products) - [Alaska Fish Fertilizer 5-1-1 Label (PDF)](https://www.domyown.com/msds/Pennington_Alaska_Fish_Emulsion_Fertilizer_Concentrate_5-1-1_Label_2020.pdf) - [Colorado State Master Gardener: Organic Fertilizers (PDF)](https://cmg.extension.colostate.edu/Gardennotes/234.pdf) **Tags:** [Soil & Composting](https://growperma.com/blog/tag/soil-composting) ## Related Articles ![Colored-pencil illustration of three backyard compost bins: a mesh ring, an enclosed bin, and a tumbler](https://growperma.com/hs-fs/hubfs/blog/images/gp-compost-bin-hero.webp?width=400&height=220&name=gp-compost-bin-hero.webp) 15 Sep [Soil & Composting](https://growperma.com/blog/tag/soil-composting) #### Best Outdoor Compost Bin: Picks by Yard Size Peter Vogel ![Water from a watering can beading and running off cracked dry garden soil instead of soaking in, beside a wilting pepper plant](https://growperma.com/hs-fs/hubfs/blog/images/gp-0549-hero-water-runoff-20260908-070106.webp?width=400&height=220&name=gp-0549-hero-water-runoff-20260908-070106.webp) 8 Sep [Soil & Composting](https://growperma.com/blog/tag/soil-composting) #### Hydrophobic Soil: Why Water Runs Off and How to Fix It Peter Vogel ![Late winter homestead pasture at dawn with frost-heaved ground, scattered clover seed and a broadcast spreader ready for frost seeding](https://growperma.com/hs-fs/hubfs/blog/images/gp-0546-hero-frost-seeding-clover-20260908-061142.webp?width=400&height=220&name=gp-0546-hero-frost-seeding-clover-20260908-061142.webp) 8 Sep [Soil & Composting](https://growperma.com/blog/tag/soil-composting) #### Frost Seeding Clover: Let Winter Plant It for You Peter Vogel ![GrowPerma](https://growperma.com/hubfs/icon-512.png) Gardens That Work Like Forests — the smart-friend guide to permaculture for normal backyards. #### Explore - [Blog](https://growperma.com/blog) - [Companion Planting](https://growperma.com/blog/tag/companion-planting) - [Soil & Composting](https://growperma.com/blog/tag/soil-composting) - [Food Forests](https://growperma.com/blog/tag/food-forest) - [Permaculture](https://growperma.com/blog/tag/permaculture-foundations) #### Resources - [About](https://growperma.com/about) - [All Articles](https://growperma.com/blog) #### Legal - [Imprint](https://growperma.com/imprint) - [Privacy Policy](https://growperma.com/privacy-policy) - [Affiliate Disclosure](https://growperma.com/affiliate-disclosure) - Cookie Settings As an Amazon Associate I earn from qualifying purchases. 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